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A Bridge Damage Location Method Based on Stationary Vehicle Test

A damage location and vehicle technology, applied in the direction of using sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., can solve problems such as finite element models, a large number of sensors, and inconvenient implementation, achieve good applicability, improve positioning efficiency, and simple data analysis process Effect

Active Publication Date: 2021-03-30
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to avoid the shortcomings of the above-mentioned prior art, the present invention provides a method for locating bridge damage based on static vehicle testing. By testing two-axle vehicles, they are gradually placed at different positions of the bridge to determine the frequency of the bridge damage. Solve the problems that traditional methods require finite element models, inconvenient implementation, difficult data processing and a large number of sensors

Method used

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  • A Bridge Damage Location Method Based on Stationary Vehicle Test
  • A Bridge Damage Location Method Based on Stationary Vehicle Test
  • A Bridge Damage Location Method Based on Stationary Vehicle Test

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0055] figure 2 The shown simply supported beam has a length of 20m and a modulus of elasticity of 7.5×10 10 N / m 2 , with a density of 2.7×10 3 kg / m 3 , the cross-section is a square section with a side length of 0.2m, and is divided into 30 intervals at equal intervals. By means of numerical simulation, it is divided into 20 planar Euler beam units for simulation, the sampling frequency is 100Hz, and the time is 200s. Using random excitation, the dynamic response of the beam is calculated by the Newmark-β method. This embodiment considers the following two working conditions:

[0056] (1) Single damage condition: interval 17, the section stiffness is reduced to 70% of the original value;

[0057] (2) Double damage condition: in interval 12, the section stiffness is reduced to 80% of the original value; in interval 20, the section stiffness is reduced to 75% of the original value.

[0058] Identification steps:

[0059] S1: Select a two-axle vehicle a with a mass of 5...

Embodiment 2

[0066] Figure 7 The shown two-span continuous beam cantilever beam has a span length of 15m, and other parameters, solution methods and identification processes are the same as in Example 1, and two working conditions are also considered:

[0067] (1) Single damage condition: interval 23, the section stiffness is reduced to 80% of the original value;

[0068] (2) Double damage condition, interval 10, the section stiffness is reduced to 70% of the original value, interval 23, the section stiffness is reduced to 75% of the original value. The positioning results under single damage condition and double damage condition are as follows: Figure 8 and Figure 9 shown.

[0069] Embodiment 1 and Embodiment 2 have verified that the method of the present invention adopts a single acceleration sensor test, and by moving the position of the two-axle vehicle, measuring multiple system frequencies, the positioning index constructed can effectively realize damage positioning; the presen...

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Abstract

The invention discloses a bridge damage positioning method based on a standing vehicle test. The method is characterized in that a single wireless acceleration sensor is installed on a two-axle vehicle to form a movable test device; the two-axle vehicle is gradually placed at different positions of a bridge for testing, and dynamic responses of the two-axle vehicle and a bridge system under environmental excitation are obtained; spectrum analysis is performed on the dynamic responses through Fourier transform to obtain a corresponding frequency; and system frequency variation curves when the two-axle vehicle is located at different positions before and after damages are compared to determine a damage position of the bridge. The method can be conveniently implemented, efficiency is high anda result is visual. Problems that a traditional damage positioning method requires a large number of test sensors, testing is complicated and data processing is difficult are effectively solved.

Description

technical field [0001] The invention relates to the field of beam structure monitoring and detection, and more specifically relates to a bridge damage location method based on static vehicle testing, and the identification result can be used to evaluate the safety state of the bridge. Background technique [0002] Bridges are critical hubs in traffic engineering. During the follow-up service, the bridge is eroded by various complex environments, such as typhoons, earthquakes, floods, corrosion, explosions, etc., as well as the long-term repeated effects of increasing vehicle load and traffic flow. Material aging, fatigue, damage accumulation, and performance degradation gradually bring huge hidden dangers to the safe operation of bridge structures, which also highlights the necessity and urgency of condition monitoring and damage identification in the process of bridge structure operation. [0003] At present, the health monitoring of bridge structures has become an importa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/12
Inventor 贺文宇任伟新王佐才
Owner HEFEI UNIV OF TECH